A mistake that can be spotted in this movie takes place when the ice monster is chasing our heroes Anna, Kristoff, and Olaf. After a while, he throws the snowman down a ravine. In the next scene, when Anna and Kristoff fall from the cliff we see that Kristoff falls under Olaf even though it was he who fell first. This is, of course, assuming physics in Frozen works in the same way as in our world.